[1] [1] Trupke T, Green M A, Wurfel P J. Appl. Phys.， 2002, 92(3): 1668.

[2] [2] Chen X B, Wu J G, Xu X L. Opt. Lett., 2009, 34(7): 887.

[3] [3] Zhou J J, Teng Y, Liu X F, et al. Opt. Express, 2010, 18(21): 21663.

[4] [4] Ewen S, Geoffrey D. Modern Raman Spectroscopy: A Practical Approach. Hoboken: NJ, John Wiley, 2005.

[5] [5] Auzel F. Phys. Rev. B, 1976, 13(7): 2809.

[6] [6] Carnell W T, Fields P R， Wybourne B G, J. Chem. Phys., 1965, 42(12): 3797.

[7] [7] Kushida T. J. Phys. Soc. Japan, 1973, 34: 1318.

[8] [8] Miyakawa T， Dexter D L. Phys. Rev. B, 1970, 1(7): 2961.

[9] [9] Kennedy J L, Djeu N. Journal of Luminescence, 2003, 101(2003): 147.

[10] [10] Henderson B， Imbusch G F. Optical Spectroscopy of Inorgannic Solids. Oxford: Clarendon Press, 1989. 12.

[12] [12] Chen X B, Wang C, Gregory J Salamob, et al. Chin. Phys. B, 2009, 18(12): 5523.

[13] [13] Reisfeld R. Lasers and Excited States of Rare-Earth. New York: Springer-Verlag， 1977. 50.